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Achromatic Lenses

Positive Achromatic Lens

Negative Achromatic Lens

Achromatic Lens is an achromatic consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element.

The elements are chosen so as to cancel chromatic aberration at two well-separated wavelengths, usually in the blue and red region of the spectrum.

Focal length is constant at those two wavelengths and focal length shifts are virtually eliminated across the visible wavelengths.

One frequent use is to achieve diffraction limited focusing of a laser beam.

Negative Achromats are typically used when there is a need to eliminate chromatic aberration.

In addition to reducing chromatic aberration at the design wavelengths, spherical aberration and coma are greatly reduced.

We can provide Positive Achromatic Lens and Negative Achromatic Lens by two piece single lens (Doublet) or three piece single lens (Triplet).

Applications:
●Projection Optics System
●Imaging Optics Systems
●Laser Measurements Systems

Specifications:
Material All optical glass per your requirements
Design Wavelength 480.0nm, 546.1nm, 643.8nm
Diameter Tolerance +0.00/-0.15mm
Paraxial Focus Length ±2% @546.1nm
Centration <3 arc minutes
Clear Aperture >Central 85% of diameter
Surface Figure λ/4@632.8nm
Surface Quality 60-40 S/D
Coating Single layer MgF2 broadband AR coating
Protective Bevel <0.25mm x 45°
Positive Achromatic Lens Standard Products:
Part No. f(mm) Φ(mm) R1 R2=R3(mm) R4(mm) tc1(mm) tc2(mm) fb(mm) Lens Lens B
(mm) A
10 6.0 6.750 -4.040 -23.390 3.69 0.72 7.6 SSK4A SF8
15 6.0 9.120 -5.860 -20.990 2.71 1.20 13.1 BK7 F2
30 6.0 16.030 -13.090 -67.61 1.40 0.60 28.8 BK7 F2
25 8.0 16.530 -10.880 -39.80 2.63 2.50 22.6 SK11 SF5
30 8.0 20.430 -12.780 -75.97 3.07 1.43 27.6 SSK4A SF8
20 10.0 13.090 -9.120 -34.28 5.56 1.80 16.5 BaK1 SF8
25 12.0 15.040 -12.480 -33.100 3.76 2.00 22.2 BaLKN3 SF15
25 12.7 16.410 -12.020 -40.74 3.76 2.00 22.2 BaK4 SF15
30 12.7 19.140 -14.030 -55.21 3.93 1.68 27.0 BaK1 SF8
40 12.7 21.280 -17.000 -89.95 3.00 0.80 37.8 BK7 F2
75 12.7 39.99 -31.990 -167.90 2.40 1.00 73.0 BK7 F2
40 18.0 25.760 -19.010 -73.79 2.64 2.50 35.9 BaK1 SF8
50 25.4 34.510 -21.980 -213.80 9.00 2.50 43.3 BaF10 SF10
60 25.4 37.67 -28.580 -72.78 10.00 2.81 53.5 BK6 SF10
80 25.4 42.46 -33.880 -183.65 5.80 2.60 75.1 BK7 F2
100 25.4 52.79 -42.46 -228.60 4.50 2.00 96.0 BK7 F2
120 25.4 73.28 -54.33 -159.96 4.20 2.00 117.103 BK7 SF5
125 25.4 76.421 -56.658 -166.815 4.38 02.09 121.925 BK7 SF5
140 30.0 93.22 -59.14 -156.67 6.52 2.51 136.0 BK7 SF5
Negative Achromatic Lens Standard Products:
Part No. f(mm) Φ(mm) R1 R2=R3(mm) R4(mm) tc1(mm) tc2(mm) fb(mm) Lens Lens B
(mm) A
-25 12.7 -15.600 13.090 44.16 3.00 2.67 -27.5 BK7 F2
-40 12.7 -24.450 17.970 66.60 3.00 2.34 -42.5 BK7 F2
-50 25.4 -31.190 24.890 85.31 3.00 4.22 -53.3 BK7 F2

Note:

Cutting LensSquare Lens, Rectangle Lens and Coatings are available upon request.

Metal Mount is also available upon request.

The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics ranging in size from diameter 3-130mm.

The manufacturing limits are not absolute; tighter tolerances may be possible.

Part specific tolerances may vary depending on component size, shape, and/or material.